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Controllable phase-transition temperature upon strain release in VO2/MgF2 epitaxial films
Shao, ZW; Wang, LL; Chang, TC; Xu, F; Sun, GY; Jin, P; Cao, X
2020-07-28
Source PublicationJOURNAL OF APPLIED PHYSICS
ISSN0021-8979
Issue4
SubtypeArticle
AbstractMetal-to-insulator transition (MIT) behaviors accompanied by a rapidly reversible phase transition in vanadium dioxide (VO2) have gained much attention from researchers. In this research, lattice-mismatched epitaxial films of VO2 (210) on MgF2 (111) substrates exhibited different phase-transition temperatures and developed a phase regulation of misfit dislocations. It reveals an "effective phase-transition regulation" for VO2 films with different thicknesses in certain substrates-MgF2. It is speculated that the dislocation density could progressively increase with the increasing thickness of the film, and the dislocation spacing distribution tends to become narrower. When the thickness of the film is close to a certain thickness, the misfit dislocation density is close to saturation for full relaxation. The misfit dislocation arrangement produces hysteresis loops of different widths upon resistance and transmittance: when the width of the transmittance hysteresis loop is narrow at 3.9 degrees C, and the resistance hysteresis loop can reach the largest width at 14.0 degrees C. Further research about the hysteresis with other substrates and the thickness-dependent transition temperature showed that the variance of hysteresis properties during the phase transition can be ascribed to the different strain states along the V-V chains and the change of the hybrid t(2g)-orbital occupancy. In addition, critical thickness along the growth direction is also discussed, which could be identified by the experimental results. This research provides a comprehensive understanding of the strain effect on phase-transition behaviors and also could be a guidance for some potential applications in optoelectronic devices.
DOI10.1063/5.0011423
WOS KeywordMETAL-INSULATOR DOMAINS ; ORGANIZATION ; MULTILAYERS ; DEFECTS
Language英语
WOS Research AreaPhysics
PublisherAMER INST PHYSICS
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27885
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Shao, ZW,Wang, LL,Chang, TC,et al. Controllable phase-transition temperature upon strain release in VO2/MgF2 epitaxial films[J]. JOURNAL OF APPLIED PHYSICS,2020(4).
APA Shao, ZW.,Wang, LL.,Chang, TC.,Xu, F.,Sun, GY.,...&Cao, X.(2020).Controllable phase-transition temperature upon strain release in VO2/MgF2 epitaxial films.JOURNAL OF APPLIED PHYSICS(4).
MLA Shao, ZW,et al."Controllable phase-transition temperature upon strain release in VO2/MgF2 epitaxial films".JOURNAL OF APPLIED PHYSICS .4(2020).
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